Should I seek Medical Attention for this skin rash?

It started underneath both armpits. It was just really itchy. I didn't notice any hives or anything. I assumed it was a combo of shaving them poorly & a heat rash. It went on for a couple weeks before it became a major concern, it kept worsening & spreading outward, this expanding red radius of skin. I... show more It started underneath both armpits. It was just really itchy. I didn't notice any hives or anything. I assumed it was a combo of shaving them poorly & a heat rash. It went on for a couple weeks before it became a major concern, it kept worsening & spreading outward, this expanding red radius of skin. I started with applications of Aloe. Then tried Cortizone, Calamine lotion, moisturizer, anti-itch cream, & when nothing worked I moved to hydrocortisone. It wasn't helping either. I nearly used the entire tube in a day. We thought it may be an allergy reaction so I had changed my entire diet & re-washed all my sheets & clothes in a fragrance free detergent, when suddenly hives began appearing in various places. It worsened & spread over a few days until it reached my face. Instead of hives, my face became blotchy, dry, & itchy. My lips feel dry & tight around the edges. The weird thing is that the main rash under my armpits has seemingly subsided. It's the rest of my body that periodically itches. What is happening?
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